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Thermally‐stimulated depolarization current studies in chemically doped poly(2,6‐dimethyl‐1,4‐phenylene oxide)
Author(s) -
Kalkar AK,
Kundagol Shankar
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199902)48:2<85::aid-pi96>3.0.co;2-l
Subject(s) - materials science , dopant , phenylene , doping , analytical chemistry (journal) , depolarization , oxide , polymer , chemistry , organic chemistry , optoelectronics , composite material , medicine , metallurgy , endocrinology
The electret properties of solution‐grown poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) films doped with 7,7,8,8‐tetracyanoquinodimethane, tetracyanoethylene, 2,4,7‐trinitro‐9‐fluorenone and I 2 have been studied by measuring thermally‐stimulated depolarization currents (TSDC) as a function of dopant concentration varying from 0.25 to 1.00 wt% for identical conditions of polarizing field, temperature and time. The depolarization behaviour of poled doped PPO film exhibits a dopant‐concentration dependent single relaxation around 438 K maximum in the TSDC spectra. This is attributed to formation of charge‐transfer complexes with the PPO chain by interstitially placed dopants. The existence of such a complex is confirmed by ultraviolet–visible and infrared absorption spectral measurements. The dopant‐concentration dependent increase in the magnitude of the TSDC peak is attributed to the enhanced aligned dipole density. © 1999 Society of Chemical Industry.